中等含水层下留设防砂煤柱开采

COAL MINING UNDER WATER-BEARING STRATA BY RETAINING PILLARS AGAINST SAND

我国新生界含水松散层下采煤的试验研究已积累了大量的技术资料和丰富的技术经验。

By studying the successful practice of coal mining under medium water-bearing strata with retaining pillarsagainst sand to reduce the size of water berrier, pointsout that the widely developed weathered zone of bed rockat the bottom of Cenozoic group significantly contributesto the safely mining with reduced water barrier. becausethe reconsolidated bed consists of strongly weathered disin-tegrated argillaceous bond fine silt sandstone has dual ac-tions of hindering the water flow and restraining the min-ing fissures from developing upward. Furthermore, un-der the effect of mining activities, the reconsolidatedweathered bed has a lower permeability but high plastici-ty, tensile strength and water-resisting ability. which con-tributes to safely reduce the water barrier and consequent-ly enhanse the mineable reserve of the coal field.